(5-x)(x+7.3)=0

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Solution for (5-x)(x+7.3)=0 equation:


Simplifying
(5 + -1x)(x + 7.3) = 0

Reorder the terms:
(5 + -1x)(7.3 + x) = 0

Multiply (5 + -1x) * (7.3 + x)
(5(7.3 + x) + -1x * (7.3 + x)) = 0
((7.3 * 5 + x * 5) + -1x * (7.3 + x)) = 0
((36.5 + 5x) + -1x * (7.3 + x)) = 0
(36.5 + 5x + (7.3 * -1x + x * -1x)) = 0
(36.5 + 5x + (-7.3x + -1x2)) = 0

Combine like terms: 5x + -7.3x = -2.3x
(36.5 + -2.3x + -1x2) = 0

Solving
36.5 + -2.3x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-36.5 + 2.3x + x2 = 0

Move the constant term to the right:

Add '36.5' to each side of the equation.
-36.5 + 2.3x + 36.5 + x2 = 0 + 36.5

Reorder the terms:
-36.5 + 36.5 + 2.3x + x2 = 0 + 36.5

Combine like terms: -36.5 + 36.5 = 0.0
0.0 + 2.3x + x2 = 0 + 36.5
2.3x + x2 = 0 + 36.5

Combine like terms: 0 + 36.5 = 36.5
2.3x + x2 = 36.5

The x term is 2.3x.  Take half its coefficient (1.15).
Square it (1.3225) and add it to both sides.

Add '1.3225' to each side of the equation.
2.3x + 1.3225 + x2 = 36.5 + 1.3225

Reorder the terms:
1.3225 + 2.3x + x2 = 36.5 + 1.3225

Combine like terms: 36.5 + 1.3225 = 37.8225
1.3225 + 2.3x + x2 = 37.8225

Factor a perfect square on the left side:
(x + 1.15)(x + 1.15) = 37.8225

Calculate the square root of the right side: 6.15

Break this problem into two subproblems by setting 
(x + 1.15) equal to 6.15 and -6.15.

Subproblem 1

x + 1.15 = 6.15 Simplifying x + 1.15 = 6.15 Reorder the terms: 1.15 + x = 6.15 Solving 1.15 + x = 6.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.15' to each side of the equation. 1.15 + -1.15 + x = 6.15 + -1.15 Combine like terms: 1.15 + -1.15 = 0.00 0.00 + x = 6.15 + -1.15 x = 6.15 + -1.15 Combine like terms: 6.15 + -1.15 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + 1.15 = -6.15 Simplifying x + 1.15 = -6.15 Reorder the terms: 1.15 + x = -6.15 Solving 1.15 + x = -6.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.15' to each side of the equation. 1.15 + -1.15 + x = -6.15 + -1.15 Combine like terms: 1.15 + -1.15 = 0.00 0.00 + x = -6.15 + -1.15 x = -6.15 + -1.15 Combine like terms: -6.15 + -1.15 = -7.3 x = -7.3 Simplifying x = -7.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, -7.3}

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